For most of Brady's career, he's been at his best in a spread offense. The 2-TE set didn't seem to deliver on its promise. At least, it didn't show much consistency in delivering. The team's best hybrid catching/blocking TE was allowed to walk. The Pats have been collecting WRs like mad, with the biggest investment going into a "pure" slot receiver. The RB signings were of good receivers. This hardly amounts to proof that the Pats are going to go to, say, a base offense with 3 wides. But it's pretty suggestive in that general direction.